20938560 has 112 divisors (see below), whose sum is σ = 70445376. Its totient is φ = 5251072.

The previous prime is 20938553. The next prime is 20938583. The reversal of 20938560 is 6583902.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15679 + ... + 16961.

Almost surely, 2^20938560 is an apocalyptic number.

20938560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20938560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35222688).

20938560 is an abundant number, since it is smaller than the sum of its proper divisors (49506816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20938560 is a wasteful number, since it uses less digits than its factorization.

20938560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320 (or 1310 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 20938560 is about 4575.8671309381. The cubic root of 20938560 is about 275.6230940166.

The spelling of 20938560 in words is "twenty million, nine hundred thirty-eight thousand, five hundred sixty".